I've been using the watch for 9 days and like it very much. It charges fast (less than 1.5 hrs), and only needs recharging about 1/week. The watch menu includes a QR code to make the 1-time pairing with the phone app easy. There are many watch faces to choose from – I picked one that shows the time, date, day of week, steps, distance, calories, heart rate, local outdoor temperature, and charge level. Other watch faces have various colors/graphics and choices for what to display, but all can be found within the app's menu (dial library). The watch and app menus are easy to navigate.
The watch is packed with features. The heart rate, blood pressure, and oxygen levels can be measured via menu on watch or in app, and can be set to continuously monitor across a chosen time range. Additional features I've used include sleep monitor metrics, stopwatch, timer, alarm clock, calendar (many years), calculator, "find phone", text messages, change brightness, how long the watchface stays lit after pressing a button or when rotating the band, and vibration settings. Additional features that I have not tried yet include reminders, selecting a physical activity to monitor, payments with Paypal, connections to various social media, connection to phone's camera, and woman's health settings.
On the phone app I can see the history for health metrics and physical activity. The language and units of measure choices are also selectable. The watch came with an instruction book that was easy to read to learn the watch features, choices, the app to download to phone and how to pair. It is supposed to be water resistant but I've purposely chosen not to test this capability.
I like this watch a lot and am very happy with the purchase.

So far the watch looks like a good product but only time will tell if it holds up. Set up was easy and it comes with a lifetime warranty.

The P900 is the second Bestinn watch that I have purchased. The first watch is still running fine, and I remain very pleased with its sleek design and accurate measurements, but the battery only lasts for a few days between charges. I wanted to try their new watch, since they greatly improved the battery life and provided many other new features. They also retained the elegant rectangular shape that I find much more appealing than the square, clunky designs of so many others.
Bestinn product quality is proving to be very good indeed and their customer service and support has been excellent for me. They answer questions promptly and really seem to value their customers and want them to come back and try new products. Their reasonable prices make this a very possible option.
The P900 is an easy to read watch, with multiple provided watch face designs. Very easy to choose among them in the Da Fit app the watch works with. Choose the face that matches your mood, or one that has exactly the readings you’re interested in at the moment. The touch screen works well, and provides access to a rich selection of fitness, health monitoring features and watch controls with a simple swipe in any of four directions. Much easier than paging through a sequence of screens until you find the one you need.
The new app design is much more colorful and easy to use, and and the integration of health data (with things like Apple Health) is greatly improved.
Bestinn is committed to providing a better watch with each new product release and has a consistently high build quality and finish. I really like their products and prices, and have no problem recommending that you try them. Five stars from me!